Question #36928 on pidgin in ubuntu changed:
https://answers.launchpad.net/ubuntu/+source/pidgin/+question/36928
Status: Open => Answered
Saša Teković proposed the following answer:
Pidgin probably disabled your YIM account (it happens sometimes if your
connection is terminated unexpectedly or something went wrong on Yahoo
server).
Try going to Accounts > Enable account > and enable your YIM account.
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